package com.platform.common.utils;

import org.springframework.util.DigestUtils;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * @author xiaoemo
 * MD5 加密工具类
 */
public class Md5Utils {

    /**
     * 32位加密
     *
     * @param plainText 明文
     * @return 32位密文
     */

    public static String encryption32(String plainText) {
        String re_md5 = new String();
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(plainText.getBytes());
            byte b[] = md.digest();

            int i;

            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0) {
                    i += 256;
                }
                if (i < 16) {
                    buf.append("0");
                }
                buf.append(Integer.toHexString(i));
            }

            re_md5 = buf.toString();

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return re_md5;
    }


    public static String encryption32(String plainText, Charset charset) {
        String re_md5 = new String();
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(plainText.getBytes(charset));
            byte b[] = md.digest();

            int i;

            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0) {
                    i += 256;
                }
                if (i < 16) {
                    buf.append("0");
                }
                buf.append(Integer.toHexString(i));
            }

            re_md5 = buf.toString();

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return re_md5;
    }

    /**
     * 加密
     *
     * @param str 待加密字符串
     * @return 加密后的字符串
     */
    public static String encrypt(String str) {
        return DigestUtils.md5DigestAsHex(str.getBytes(StandardCharsets.UTF_8));
    }

    public static boolean equals(String str, String md5) {
        return encrypt(str).equalsIgnoreCase(md5);
    }
}
